998 resultados para Heinrich, der Jüngere, Duke of Brunswick-Wolfenbüttel, 1489-1568.
Resumo:
In this paper a modified version of the classical Van der Pol oscillator is proposed, introducing fractional-order time derivatives into the state-space model. The resulting fractional-order Van der Pol oscillator is analyzed in the time and frequency domains, using phase portraits, spectral analysis and bifurcation diagrams. The fractional-order dynamics is illustrated through numerical simulations of the proposed schemes using approximations to fractional-order operators. Finally, the analysis is extended to the forced Van der Pol oscillator.
Resumo:
The essential oils of the leaves and branches of Sextonia rubra were obtained by hydrodistillation and analyzed by GC-FID and GC-MS. In the leaves were identified as the major constituents α-pinene (21.7%), β-pinene (15.4%), α-copaene (12.5%) and germacrene D (12.1%). In the branches essential oil, α-copaene (22.9%), β-selinene (7.9%) and β-elemene (7.2%) were identified as the most abundant constituents. This paper describes for the first time the composition of these essential oils.
Resumo:
1858 v. 1
Resumo:
1874 v. 2
Resumo:
1900 v. 3
Resumo:
v.1-6
Resumo:
v.7 pt.1-3
Resumo:
v.7 pt.4-5
Resumo:
1
Resumo:
2
Resumo:
[s.c.]